in an interfaith service here in boston.presidentobamawillbe in attendance along with many others including mitt romney, former governor of massachusetts. cnn will bring you that service live. >> here in boston, many of the people who came here just for the marathon have not left. there is a sense of connection here now to what's going on. some of it is waiting to see what happens, if there's a discovery. but it's now just feeling the sense of moving on and being here together. susan candiotti has seen the pictures of the two men. she joins us now. susan, what do these images show to your eye? >> well, very interesting because, of course, they're standing in a huge crowd of people. and you've got two men who are standing there as described to us also by investigators, the reason they're interested is because it's near the finish line around where all those flags are that you've been seeing time and again right near the finish line. and what's pieeking the interes among other things is that they're carrying bags with them. one of them is a dark colored backpack and another one appears to be